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		<h1 id="Validation_rules">Validation rules</h1>
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				<td>REQ_Relation_01 - Null relation type check</td>
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				<td colspan="2">This rule checks that a Relation has its Relation Type set with a non null value. </td>
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				<td>REQ_Relation_02 - Unique relation type check</td>
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				<td colspan="2">This rule checks that a relation of a given type between the same source and target must be unique.</td>
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